COMP2421 - Computer Organization

The Dell EMC S5148 switch is an innovative, future-ready T op-of-Rack (T oR) open networking switch providing excellent capabilities and cost-effectiveness for the enterprise, mid-market, Tier2 cloud and NFV service providers with demanding compute and storage traffic environments.The S5148F-ON 25GbE switch is Dell EMC’s latest disaggregated hardware and software data center networking solution that provides state-of-the-art data plane programmability, backward compatible 25GbE server port connections, 100GbE uplinks, storage optimized architecture, and a broad range of functionality to meet the growing demands of today’s data center environment now and in the future.The compact S5148F-ON model design provides industry-leading density with up to 72 ports of 25GbE or up to 48 ports of 25GbE and 6 ports of 100GbE in a 1RU form factor.Using industry-leading hardware and a choice of Dell EMC’s OS10 or select 3rd party network operating systems and tools, the S5148F-ON Series offers flexibility by provision of configuration profiles and delivers non-blocking performance for workloads sensitive to packet loss. The compact S5148F-ON model provides multi rate speedenabling denser footprints and simplifying migration to 25GbE server connections and 100GbE fabrics.Data plane programmability allows the S5148F-ON to meet thedemands of the converged software defined data center by offering support for any future or emerging protocols, including hardware-based VXLAN (Layer 2 and Layer 3 gateway) support. Priority-based flow control (PFC), data center bridge exchange (DCBX) and enhanced transmission selection (ETS) make the S5148F-ON an excellent choice for DCB environments.The Dell EMC S5148F-ON model supports the open source Open Network Install Environment (ONIE) for zero touch installation of alternate network operating systems.Maximum performance and functionalityThe Dell EMC Networking S-Series S5148F-ON is a high-performance, multi-function, 10/25/40/50/100 GbE T oR switch purpose-built for applications in high-performance data center, cloud and computing environments.In addition, the S5148F-ON incorporates multiple architectural features that optimize data center network flexibility, efficiency, and availability, including IO panel to PSU airflow or PSU to IO panel airflow for hot/Key applications •Organizations looking to enter the software-defined data center era with a choice of networking technologies designed to deliver the flexibility they need• Use cases that require customization to any packet processing steps or supporting new protocols• Native high-density 25 GbE T oR server access in high- performance data center environments• 25 GbE backward compatible to 10G and 1G for future proofing and data center server migration to faster uplink speeds. • Capability to support mixed 25G and 10G servers on front panel ports without any limitations• iSCSI storage deployment including DCB converged lossless transactions• Suitable as a T oR or Leaf switch in 100G Active Fabric implementations• As a high speed VXLAN L2/L3 gateway that connects the hypervisor-based overlay networks with non-virtualized • infrastructure•Emerging applications requiring hardware support for new protocolsKey features •1RU high-density 25/10/1 GbE T oR switch with up to forty eight ports of native 25 GbE (SFP28) ports supporting 25 GbE without breakout cables• Multi-rate 100GbE ports support 10/25/40/50 GbE• 3.6 Tbps (full-duplex) non-blocking, cut-through switching fabric delivers line-rate performance under full load**• Programmable packet modification and forwarding • Programmable packet mirroring and multi-pathing • Converged network support for DCB and ECN capability • IO panel to PSU airflow or PSU to IO panel airflow • Redundant, hot-swappable power supplies and fans • IEEE 1588v2 PTP hardware supportDELL EMC NETWORKING S5148F-ON SERIES SWITCHProgrammable high-performance open networking top-of-rack switch with native 25Gserver ports and 100G network fabric connectivity• FCoE transit (FIP Snooping)• Full data center bridging (DCB) support for lossless iSCSI SANs, RoCE and converged network.• Redundant, hot-swappable power supplies and fans• I/O panel to PSU airflow or PSU to I/O panel airflow(reversable airflow)• VRF-lite enables sharing of networking infrastructure and provides L3 traffic isolation across tenants• 16, 28, 40, 52, 64 10GbE ports availableKey features with Dell EMC Networking OS10• Consistent DevOps framework across compute, storage and networking elements• Standard networking features, interfaces and scripting functions for legacy network operations integration• Standards-based switching hardware abstraction via Switch Abstraction Interface (SAI)• Pervasive, unrestricted developer environment via Control Plane Services (CPS)• Open and programmatic management interface via Common Management Services (CMS)• OS10 Premium Edition software enables Dell EMC layer 2 and 3 switching and routing protocols with integrated IP Services,Quality of Service, Manageability and Automation features• Platform agnostic via standard hardware abstraction layer (OCP-SAI)• Unmodified Linux kernel and unmodified Linux distribution• OS10 Open Edition software decoupled from L2/L3 protocol stack and services• Leverage common open source tools and best-practices (data models, commit rollbacks)• Increase VM Mobility region by stretching L2 VLAN within or across two DCs with unique VLT capabilities• Scalable L2 and L3 Ethernet Switching with QoS, ACL and a full complement of standards based IPv4 and IPv6 features including OSPF, BGP and PBR• Enhanced mirroring capabilities including local mirroring, Remote Port Mirroring (RPM), and Encapsulated Remote Port Mirroring(ERPM).• Converged network support for DCB, with priority flow control (802.1Qbb), ETS (802.1Qaz), DCBx and iSCSI TLV• Rogue NIC control provides hardware-based protection from NICS sending out excessive pause frames48 line-rate 25 Gigabit Ethernet SFP28 ports6 line-rate 100 Gigabit Ethernet QSFP28 ports1 RJ45 console/management port with RS232signaling1 Micro-USB type B optional console port1 10/100/1000 Base-T Ethernet port used asmanagement port1 USB type A port for the external mass storage Size: 1 RU, 1.72 h x 17.1 w x 18.1” d (4.4 h x 43.4 w x46 cm d)Weight: 22lbs (9.97kg)ISO 7779 A-weighted sound pressure level: 59.6 dBA at 73.4°F (23°C)Power supply: 100–240 VAC 50/60 HzMax. thermal output: 1956 BTU/hMax. current draw per system:5.73A/4.8A at 100/120V AC2.87A/2.4A at 200/240V ACMax. power consumption: 516 Watts (AC)T yp. power consumption: 421 Watts (AC) with all optics loadedMax. operating specifications:Operating temperature: 32° to 113°F (0° to 45°C) Operating humidity: 5 to 90% (RH), non-condensingFresh Air Compliant to 45CMax. non-operating specifications:Storage temperature: –40° to 158°F (–40° to70°C)Storage humidity: 5 to 95% (RH), non-condensingRedundancyHot swappable redundant power suppliesHot swappable redundant fansPerformanceSwitch fabric capacity: 3.6TbpsPacket buffer memory: 16MBCPU memory: 16GBMAC addresses: Up to 512KARP table: Up to 256KIPv4 routes: Up to 128KIPv6 routes: Up to 64KMulticast hosts: Up to 64KLink aggregation: Unlimited links per group, up to 36 groupsLayer 2 VLANs: 4KMSTP: 64 instancesLAG Load Balancing: User Configurable (MAC, IP, TCP/UDPport)IEEE Compliance802.1AB LLDPTIA-1057 LLDP-MED802.1s MSTP802.1w RSTP 802.3ad Link Aggregation with LACP802.3ae 10 Gigabit Ethernet (10GBase-X)802.3ba 40 Gigabit Ethernet (40GBase-X)802.3i Ethernet (10Base-T)802.3u Fast Ethernet (100Base-TX)802.3z Gigabit Ethernet (1000BaseX)802.1D Bridging, STP802.1p L2 Prioritization802.1Q VLAN T agging, Double VLAN T agging,GVRP802.1Qbb PFC802.1Qaz ETS802.1s MSTP802.1w RSTPPVST+802.1X Network Access Control802.3ab Gigabit Ethernet (1000BASE-T) orbreakout802.3ac Frame Extensions for VLAN T agging802.3ad Link Aggregation with LACP802.3ae 10 Gigabit Ethernet (10GBase-X)802.3ba 40 Gigabit Ethernet (40GBase-SR4,40GBase-CR4, 40GBase-LR4, 100GBase-SR10,100GBase-LR4, 100GBase-ER4) on optical ports802.3bj 100 Gigabit Ethernet802.3u Fast Ethernet (100Base-TX) on mgmtports802.3x Flow Control802.3z Gigabit Ethernet (1000Base-X) with QSAANSI/TIA-1057 LLDP-MEDJumbo MTU support 9,416 bytesLayer2 Protocols4301 Security Architecture for IPSec*4302 I PSec Authentication Header*4303 E SP Protocol*802.1D Compatible802.1p L2 Prioritization802.1Q VLAN T agging802.1s MSTP802.1w RSTP802.1t RPVST+802.3ad Link Aggregation with LACPVLT Virtual Link TrunkingRFC Compliance768 UDP793 TCP854 T elnet959 FTP1321 MD51350 TFTP2474 Differentiated Services2698 T wo Rate Three Color Marker3164 Syslog4254 SSHv2791 I Pv4792 ICMP826 ARP1027 Proxy ARP1035 DNS (client)1042 Ethernet Transmission1191 Path MTU Discovery1305 NTPv41519 CIDR1812 Routers1858 IP Fragment Filtering2131 DHCP (server and relay)5798 VRRP3021 31-bit Prefixes3046 DHCP Option 82 (Relay)1812 Requirements for IPv4 Routers1918 Address Allocation for Private Internets2474 Diffserv Field in IPv4 and Ipv6 Headers2596 Assured Forwarding PHB Group3195 Reliable Delivery for Syslog3246 Expedited Assured Forwarding4364 VRF-lite (IPv4 VRF with OSPF andBGP)*General IPv6 Protocols1981 Path MTU Discovery*2460 I Pv62461 Neighbor Discovery*2462 Stateless Address AutoConfig2463 I CMPv62464 Ethernet Transmission2675 Jumbo grams3587 Global Unicast Address Format4291 IPv6 Addressing2464 Transmission of IPv6 Packets overEthernet Networks2711 IPv6 Router Alert Option4007 IPv6 Scoped Address Architecture4213 Basic Transition Mechanisms for IPv6Hosts and Routers4291 IPv6 Addressing Architecture5095 Deprecation of T ype 0 Routing Headers inI Pv6IPv6 Management support (telnet, FTP, TACACS,RADIUS, SSH, NTP)OSPF (v2/v3)1587 NSSA1745 OSPF/BGP interaction1765 OSPF Database overflow2154 MD52328 OSPFv22370 Opaque LSA3101 OSPF NSSA3623 OSPF Graceful Restart (Helper mode)*BGP 1997 Communities 2385 MD52439 Route Flap Damping 2796 Route Reflection 2842 Capabilities 2918 Route Refresh 3065 Confederations 4271 BGP-44360 Extended Communities 4893 4-byte ASN5396 4-byte ASN Representation 5492Capabilities AdvertisementLinux Distribution Debian Linux version 8.4Linux Kernel 3.16MIBSIP MIB– Net SNMPIP Forward MIB– Net SNMPHost Resources MIB– Net SNMP IF MIB – Net SNMP LLDP MIB Entity MIB LAG MIBDell-Vendor MIBTCP MIB – Net SNMP UDP MIB – Net SNMP SNMPv2 MIB – Net SNMP Network Management SNMPv1/2SSHv2FTP, TFTP, SCP SyslogPort Mirroring RADIUS 802.1XSupport Assist (Phone Home)Netconf APIs XML SchemaCLI Commit (Scratchpad)AutomationControl Plane Services APIs Linux Utilities and Scripting Tools Quality of Service Access Control Lists Prefix List Route-MapRate Shaping (Egress)Rate Policing (Ingress)Scheduling Algorithms Round RobinWeighted Round Robin Deficit Round Robin Strict PriorityWeighted Random Early Detect Security 2865 RADIUS 3162 Radius and IPv64250, 4251, 4252, 4253, 4254 SSHv2Data center bridging802.1QbbPriority-Based Flow Control802.1Qaz Enhanced Transmission Selection (ETS)*Data Center Bridging eXchange(DCBx) DCBx Application TLV (iSCSI, FCoE*)Regulatory compliance SafetyUL/CSA 60950-1, Second Edition EN 60950-1, Second EditionIEC 60950-1, Second Edition Including All National Deviations and Group DifferencesEN 60825-1 Safety of Laser Products Part 1: EquipmentClassification Requirements and User’s GuideEN 60825-2 Safety of Laser Products Part 2: Safety of Optical Fibre Communication Systems FDA Regulation 21 CFR 1040.10 and 1040.11Emissions & Immunity EMC complianceFCC Part 15 (CFR 47) (USA) Class A ICES-003 (Canada) Class AEN55032: 2015 (Europe) Class A CISPR32 (International) Class AAS/NZS CISPR32 (Australia and New Zealand) Class AVCCI (Japan) Class A KN32 (Korea) Class ACNS13438 (T aiwan) Class A CISPR22EN55022EN61000-3-2EN61000-3-3EN61000-6-1EN300 386EN 61000-4-2 ESDEN 61000-4-3 Radiated Immunity EN 61000-4-4 EFT EN 61000-4-5 SurgeEN 61000-4-6 Low Frequency Conducted Immunity NEBSGR-63-Core GR-1089-Core ATT -TP-76200VZ.TPR.9305RoHSRoHS 6 and China RoHS compliantCertificationsJapan: VCCI V3/2009 Class AUSA: FCC CFR 47 Part 15, Subpart B:2009, Class A Warranty1 Year Return to DepotLearn more at /Networking*Future release**Packet sizes over 147 BytesIT Lifecycle Services for NetworkingExperts, insights and easeOur highly trained experts, withinnovative tools and proven processes, help you transform your IT investments into strategic advantages.Plan & Design Let us analyze yourmultivendor environment and deliver a comprehensive report and action plan to build upon the existing network and improve performance.Deploy & IntegrateGet new wired or wireless network technology installed and configured with ProDeploy. Reduce costs, save time, and get up and running cateEnsure your staff builds the right skills for long-termsuccess. Get certified on Dell EMC Networking technology and learn how to increase performance and optimize infrastructure.Manage & SupportGain access to technical experts and quickly resolve multivendor networking challenges with ProSupport. Spend less time resolving network issues and more time innovating.OptimizeMaximize performance for dynamic IT environments with Dell EMC Optimize. Benefit from in-depth predictive analysis, remote monitoring and a dedicated systems analyst for your network.RetireWe can help you resell or retire excess hardware while meeting local regulatory guidelines and acting in an environmentally responsible way.Learn more at/Services。

《计算机英语（第2版）》参考答案注：这里仅给出《计算机英语（第2版）》新增或变化课文的答案，其他未改动课文答案参见《计算机英语（第1版）》原来的答案。

Unit OneSection CPDA Prizefight: Palm vs. Pocket PCI. Fill in the blanks with the information given in the text:1. With DataViz’s Documents To Go, you can view and edit desktop documents on your PDA without converting them first to a PDA-specific ________. (format)2. Both Palm OS and Windows Mobile PDAs can offer e-mail via ________ so that new messages received on your desktop system are transferred to the PDA for on-the-go reading. (synchronization)3. The Windows Mobile keyboard, Block Recognizer, and Letter Recognizer are all ________ input areas, meaning they appear and disappear as needed. (virtual)4. Generally speaking, Windows Mobile performs better in entering information and playing ________ files while Palm OS offers easier operation, more ________ programs, better desktop compatibility, and a stronger e-mail application. (multimedia; third-party)II. Translate the following terms or phrases from English into Chinese and vice versa:1. data field数据字段2. learning curve学习曲线3. third-party solution第三方解决方案4. Windows Media Player Windows媒体播放器5. 开始按钮Start button6. 指定输入区designated input area7. 手写体识别系统handwriting-recognition system8. 字符集character setUnit ThreeSection BLonghorn：The Next Version of WindowsI. Fill in the blanks with the information given in the text:1. NGSCB, the new security architecture Microsoft is developing for Longhorn, splits the OS into two parts: a standard mode and a(n) ________ mode. (secure)2. It is reported that Longhorn will provide different levels of operation that disable the more intensive Aero effects to boost ________ on less capable PCs. (performance)3. With Longhorn’s new graphics and presentation engine, we can create and display Tiles on the desktop, which remind us of the old Active Desktop but are based on ________ instead of ________. (XML; HTML)4. The most talked-about feature in Longhorn so far is its new storage system, WinFS, whichworks like a(n) ________ database. (relational)II. Translate the following terms or phrases from English into Chinese and vice versa:1. search box搜索框2. built-in firewall内置防火墙3. standalone application独立应用程序4. active desktop 活动桌面5. mobile device移动设备6. 专有软件proprietary software7. 快速加载键quick-launch key8. 图形加速器graphics accelerator9. 虚拟文件夹virtual folder10. 三维界面three-dimensional interfaceUnit FourSection CArraysI. Fill in the blanks with the information given in the text:1. Given the array called object with 20 elements, if you see the term object10, you know the array is in ________ form; if you see the term object[10], you know the array is in ________ form. (subscript; index)2. In most programming languages, an array is a static data structure. When you define an array, the size is ________. (fixed)3. A(n) ________ is a pictorial representation of a frequency array. (histogram)4. An array that consists of just rows and columns is probably a(n) ________ array. (two-dimensional)II. Translate the following terms or phrases from English into Chinese and vice versa:1. bar chart条形图2. frequency array频率数组3. graphical representation图形表示4. multidimensional array多维数组5. 用户视图user(’s) view6. 下标形式subscript form7. 一维数组one-dimensional array8. 编程结构programming constructUnit FiveSection BMicrosoft .NET vs. J2EEI. Fill in the blanks with the information given in the text:1. One of the differences between C# and Java is that Java runs on any platform with a Java Virtual ________ while C# only runs in Windows for the foreseeable future. (Machine)2. With .NET, Microsoft is opening up a channel both to ________ in other programming languages and to ________. (developers; components)3. J2EE is a single-language platform; calls from/to objects in other languages are possiblethrough ________, but this kind of support is not a ubiquitous part of the platform. (CORBA)4. One important element of the .NET platform is a common language ________, which runs bytecodes in an Internal Language format. (runtime)II. Translate the following terms or phrases from English into Chinese and vice versa:1. messaging model消息收发模型2. common language runtime通用语言运行时刻（环境）3. hierarchical namespace分等级层次的名称空间4. development community开发社区5. CORBA公用对象请求代理（程序）体系结构6. 基本组件base component7. 元数据标记metadata tag8. 虚拟机virtual machine9. 集成开发环境IDE（integrated development environment）10. 简单对象访问协议SOAP（Simple Object Access Protocol）Unit SixSection ASoftware Life CycleI. Fill in the blanks with the information given in the text:1. The development process in the software life cycle involves four phases: analysis, design, implementation, and ________. (testing)2. In the system development process, the system analyst defines the user, needs, requirements and methods in the ________ phase. (analysis)3. In the system development process, the code is written in the ________ phase. (implementation)4. In the system development process, modularity is a very well-established principle used in the ________ phase. (design)5. The most commonly used tool in the design phase is the ________. (structure chart)6. In the system development process, ________ and pseudocode are tools used by programmers in the implementation phase. (flowcharts)7. Pseudocode is part English and part program ________. (logic)8. While black box testing is done by the system test engineer and the ________, white box testing is done by the ________. (user; programmer)II. Translate the following terms or phrases from English into Chinese and vice versa:1. standard graphical symbol标准图形符号2. logical flow of data标准图形符号3. test case测试用例4. program validation程序验证5. white box testing白盒测试6. student registration system学生注册系统7. customized banking package定制的金融软件包8. software life cycle软件生命周期9. user working environment用户工作环境10. implementation phase实现阶段11. 测试数据test data12. 结构图structure chart13. 系统开发阶段system development phase14. 软件工程software engineering15. 系统分析员system(s) analyst16. 测试工程师test engineer17. 系统生命周期system life cycle18. 设计阶段design phase19. 黑盒测试black box testing20. 会计软件包accounting packageIII. Fill in each of the blanks with one of the words given in the following list, making changes if necessary:development; testing; programmer; chart; engineer; attend; interfacessystem; software; small; userdevelop; changes; quality; board; UncontrolledIV. Translate the following passage from English into Chinese:软件工程是软件开发的一个领域；在这个领域中，计算机科学家和工程师研究有关的方法与工具，以使高效开发正确、可靠和健壮的计算机程序变得容易。

图灵奖（数据库方向）DBTG的系统结构DBTG的系统结构主要包括模式(schema)、子模式(subschema)、物理模式(physicalschema)、数据操纵和数据库管理系统(DBMS，DataBaseManagementSystem)等几个部分。

模式是对数据库整体数据逻辑结构的描述，它对应数据库的概念层，由数据库管理员借助模式数据描述语言DDL(DataDescriptionLanguage)建立。

子模式是某一用户对他所关心的那部分数据的数据结构的描述，对应于数据库的外层或用户视图(userview)，是由该用户自己或委托数据库管理员借助子模式数据描述语言加以定义的。

物理模式或叫存储模式(storageschema)是对数据库的数据的存储组织方式的描述，对应于数据库的物理层，由数据库管理员通过数据存储描述语言DSDL(DataStorageDescriptionLanguage)加以定义(DSDL是DBTG报告的1978年版本提出的，之前的报告用的名称叫数据介质控制语言DMCLDataMediaControlLanguage)。

数据库可由多个用户、多个应用共享，数据库应用程序利用数据操纵语言DML(DataManupilationLanguage)实现对数据库数据的操纵，但一个应用程序必须援引某一模式的某一子模式(也就是说它操作的数据限于某一用户视图中的数据)。

DML语句可以嵌在宿主语言(如COBOL，Fortran等)中，在数据库管理系统的控制下访问数据库中的数据，并通过一个称为用户工作区UW A(UserWorkArea)的缓冲区与数据库通信，完成对数据库的操作。

数据库管理系统的其他功能包括维护数据库中数据的一致性(consistency)、完整性(integrity)、安全性(security)和一旦出现故障情况下的恢复(recovery)，以及在多个应用程序同时存取同一数据单元时处理并发性(concurrency)，以避免出现“脏数据”(d irtydata)或“丢失更新”(10seupdate)等不正常现象。

高级英语第一册课后习题答案Lesson11)A bazaar is a market or street of shops and stands in Oriental countries．Such bazaars are likely to be found in Afghanistan，the Arabian Peninsula，Cyprus，Asiatic Turkey and Egypt．2)The bazaar includes many markets：cloth—market，copper—smiths’market．carpet—market，food—market，dye—market，pottery—market，carpenters’market，etc．They represent the backward feudal economy．3)A blind man could know which part 0f the bazaar he was in by his senses of smell and hearing．Different odours and sounds can give him some ideas about the various parts 0f the bazaar．4)Because the earthen floor，beaten hard by countless feet，deadens the sound of footsteps，and the vaulted mudbrick walls and roof have hardly and sounds to echo. The shop-keepers also speak in slow, measured tones, and the buyers follow suit.5)The place where people make linseed oil seems the most picturesque in the bazaar. The backwardness of their extracting oil presents an unforgettable scene.II .1)little donkeys went in and out among the people and from one side to another2)Then as you pass through a big crowd to go deeper into the market, the noise of the entrance gradually disappear, and you come to the much quieter cloth-market.3)they drop some of items that they don't really want and begin to bargain seriously for a low price.4)He will ask for a high price for the item and refuse to cut down the price by any significant amount.5)As you get near it, a variety of sounds begin to strike your ear.Ⅲ. See th e translation of text.IV.1)n. +n..seaside, doorway, graveyard, warlord2)n. +v..daybreak, moonrise, bullfight3)v. +n..cutback, cutthroat, rollway4)adj. +n..shortterm, softcoal, softliner, hardware5)adv. +v. .output , upgrade, downpour6)v. +adv..pullover, buildupV.1)thread (n.) she failed to put the thread through the eye of the needle.(v.) He threaded through the throng.2)round (v.) On the 1st of September the ship rounded the Cape of Good Hope. (adv.) He wheeled round and faced me angrily.3)narrow(v.) In the discussions we did not narrow the gap any further. (adj．)He failed by a very narrow margin．4)price(n．) The defence secretary said the U．S．was not looking for an agreement at any price．(v．)At the present consumption rates(of oil)the world may well be pricing itself out of its future．5) (v．)live About 40％of the population lives on the land and tries to live off it． (adj．)The nation heard the inaugural speech in a live broadcast．6)tower (n．)The tower was built in the 1 4th century．(v．)The general towered over his contemporaries．7)dwarf (v．)A third of the nation's capital goods are shipped from this area，which dwarfs West Germany's mighty Ruhr Valley in industrial output．(n．)Have you ever read the story of Snow White and the Dwarfs?Ⅵ．1)light and heat：glare，dark，shadowy，dancing flashes．the red of the live coals，glowing bright，dimming，etc．2)sound and movement：enter，pass，thread their way．penetrate，selecting，pricing，doing a little preliminary bargaining，din，tinkling，banging，clashing，creak，squeaking，rumbling，etc．3)smell and colour：profusion of rich colours，pungent and exotic smells，etc．Ⅶ．1)glare指刺眼的光；brightness指光源发出的强烈稳定的光，强调光的强度。

总687期第二十五期2019年9月河南科技Henan Science and Technology 基于RobotStudio 的双机协同工作站仿真设计李怡林（四川工商职业技术学院，四川成都611830）摘要：本文介绍了一种借助RobotStudio 软件构建机器人搬运、焊接等多功能于一体的双机协作工作站虚拟仿真方案。

首先，利用SolidWorks 三维建模软件对机器人末端夹具进行三维设计，搭建基于RobotStudio 仿真软件的双机协作虚拟仿真平台空间布局；其次，设计双机协作工作站工艺流程，完成动态Smart 组件及工作站逻辑设定；最后，完成工作站系统离线编程与仿真优化。

仿真结果表明，该虚拟双机协作工作站可实现搬运、焊接等作业，该方案可为焊接生产线设计提供可行性参考。

关键词：RobotStudio ；双机协同；离线仿真中图分类号：TP242文献标识码：A 文章编号：1003-5168（2019）25-0014-05Simulation Design of Two-machine CooperativeWorkstation Based on RobotStudioLI Yilin （Sichuan Technology &Business College ，Chengdu Sichuan 611830）Abstract:This paper introduced a virtual simulation scheme of two computer cooperative workstation,which was based on the RobotStudio software to build a multi-functional integration of robot handling and welding.First of all,3D designof robot endfixturewas carried out by usingSolidWorks3Dmodeling software,andspatiallayout of dualcomputer collaborative virtual simulation platform was built based on RobotStudio simulation software;secondly,pro⁃cess flow of dual computer collaborative workstation was designed,dynamic Smart components and logic setting of workstation were completed;finally,offline programming and simulation optimization of workstation system were com⁃pleted.Thesimulation results show that the virtual two machine cooperative workstation can realize the operation of carrying and welding,and the scheme can provide a feasible reference for the design of welding production line.Keywords:RobotStudio ；two computer collaboration ；offline simulation 工业机器人应用仿真是指通过计算机软件对实际的机器人系统进行模拟和检测，其间可以在仿真软件中进行与实际一致的全部工业机器人应用编程与调试［1］。

一、选择题1.What is the process of converting a high-level programming language into machine languagecalled?A.Debuggingpilation（正确答案）C.ExecutionD.Interpretation2.Which of the following is a programming paradigm that organizes software design around data,and the operations performed on that data?A.Object-oriented programming（正确答案）B.Procedural programmingC.Functional programmingD.Event-driven programming3.In computer networks, what does the term "protocol" refer to?A. A set of rules governing the exchange of information between devices（正确答案）B.The physical connection between devicesC.The speed of data transmissionD.The type of data being transmitted4.What is the term used to describe the process of dividing a complex problem into smaller, moremanageable parts?A.Modularization（正确答案）B.OptimizationC.EncapsulationD.Polymorphism5.In computer security, what is the term for unauthorized access to or modification of data?A.EncryptionB.DecryptionC.Hacking（正确答案）D.Firewall6.Which of the following is a type of software that allows two or more computers tocommunicate and share resources?A.Operating systemB.Database management systemwork operating system（正确答案）D.Word processing software7.What is the term used to describe the process of identifying and correcting errors in computerprograms?A.Debugging（正确答案）B.TestingC.Codingpilation8.In computer graphics, what is the term for the number of distinct pixels that can be displayedon a screen?A.Resolution（正确答案）B.Color depthC.Refresh rateD.Aspect ratio。